Abstract

This paper is a summary of work carried out during the past five years as part of an ONR/NAVAIR
Research Initiative. The effort has been devoted to developments and applications of an approximate analysis
intended to provide understanding of observed behavior and guidelines for design and development. Although
most of the work has been carried out for longitudinal modes, quite extensive results have been obtained for
transverse modes in a circular chamber, for both second and third order nonlinear gasdynamics. Especially
important are the useful conclusions based on the simplified two-mode approximation. Preliminary results
obtained for the influences of stochastic sources suggest that some of the observed behavior of the amplitudes
of oscillations may be attributed to random inputs, such as flow separation and turbulence. Some important
aspects of the problem of existence and stability of limit cycles in linearly stable systems ("triggering") remain
unclear.

Item Type:

Report or Paper (Working Paper)

Additional Information:

This work was supported partly by the California Institute of Technology and by the Office of Naval Research, under Contract N00014-84-K-0434. Approved for public release; distribution is unlimited